Pipe wrench



PIPE WRENCH Filed Aug. 21. 1928 l9 I" ////jnummmmmmnmun l3 r 9 Inn/en. bova wrench wherein both gripp ng jaws are vided with apertures 16 and 17 respectively,

parts.

force is exerted u on the handle to turn the is carried b a pivot 3 in 21. Hence when P a 1 a Patented June 23, 1931 innr'rsn STATES PATENT orsies JAMES E. BLALOOK, OF PACIFIC PALISADES, CALIFOEIIIA PIPE WRENCH Application filed August 21, 1928. Serial No. 301,003.

This invention relates to wrenches, and has portion 9 and extending adjacent the handle I for an object, the provision of an improved portion 7 of the shank 6. type of automatically adjustable wrench. A pair of gripping jaws 13 and 14 are slid- A more detailed object is the provision of ably mounted upon the shank 6, being proslidably mounted upon the shank, and which through which the shank 6 is received. is provided with means for forcing the jaws The upper gripping jaw 13 is operatively together by squeezing the handle which is connected to the transverse portion 9 of the composed of a pair of relatively movable lever 8, by preferably a pair of links 18.

' These links 18 are pivoted to the jaw 13 at p A further object is the provision of a their upper ends by a pivot pin 19, and are Wrench having slidable jawsas described, the pivotally connected to the transverse porjaws being so arranged and operably contion 9 adjacent its after end, i. e., the end nected to one of the handle sections, that when adjacent which the longitudinal portion 12 work gripped between the jaws, an extra d'ethe lever 8 is swung about its pivotal mountgree of compression of thejaws upon the work ing 11 in that direction which reduces the is developed, this compression being propordistance between the two portions 7 and 12 tional to the force exerted upon the handle. constituting the handle, the upper jaw 13 20 With the foregoing and other objects in is slid downwards upon the shank 6.

view which will be made manifest in the fol- Similarly, the lower jaw 14 is operatively lowing detailed description and specifically connectedto the forward end of the transpointed out in the appended claims, referverse portion 9 of the lever 8. For this purenee is had to the accompanying drawing pose, preferably a bifurcated link22 is piv- Z for an illustrative embodiment of the invented at its upper ends to the jaw 14 by a pivot tion, wh r in; 23, and at its lower end to the forward ends Figure 1 is a side elevation of the wrench 0f th ransverse portion 9, by a pivot pin 24. of my invention howin th aw th e f i As a result of this connection, when the lever fully collapsed position. 8 1s swung about its pivot 11 to move the upac Fig. 2 is a rear elevation, the direction of P l 13 downwards, the lower l 14 will to reduce the size of the figure.

i b i i di t d b th arrow 2 f Fi 1 be forced upwards, reducing the effective disr Fig. 3 is a view similar to Fig. 1, but showfiance between the J ingr thg jaws gripping a therebetween Preferably the OppOSGCl 3 088 26 and 27 0f and witha portion of the wrench broken away the J -WS 13 and 14 respectlvely, are formed complementarily arcuate, the arcuate face :35 Fig. 4 is a vertical, medial, sectional view, of the J belhg CPhCaVe, and the arcuate the plane of section being indicated by the face of the l 14 helhg h These 9 line 4-4 of Fig. 2. cave faces 26 and 27 are provided with gr1p- Specifically describing the invention in the P g teeth 28 l 29 p lya y means t ti l f f hi h I am t pres of which round ob ects such as pipes and bars, ent aware, the wrench comprises a shank 6, y be readily gripped. In order to fac lione end of which is extended to provide a 1521356 retehtloh of thejaws 13 and 14 1h g pti f th h dl 7 Th remainder f ping engagement with such round ob ects, the handle is formed a lever 8 comprising the teeth Of the upper 133V are formed a U-shaped, transverse portion 9 pivoted to so that they slope toward the shank 6, and the shank 6 by a pin 10 rigid with the trails the teeth 29 of the lower jaw 14 are formed verse portion 9 and slidably disposed within so that they slope away from the shank 6. a slot 11 extending longitudinally of the A spring 31 is under tension between the shank 6, and a longitudinal portion 12 rigid lower jaw 14 and a projection 32 therebelow and preferably integral with the transverse upon the handle end 7 of the shank 6. This 1 spring tends to retain the jaw 14 in its lowermost position, resulting through the connection of the bifurcated link 22 in retaining the U-shaped, transverse portion 9 also in its lowermost position with the pin 10 disposed in the lower end of the slot 11.

In operation, the jaws 13 andllmay be separated in order to position them upon op posite sides of the pipe 33 or other work to be gripped byseparating the portions 7 and 12 of the handle. The aws 13 andll may then be brought into engagement withthe pipe 33 by pressing the portions 7 and 120% the handle to ether movin the 'aws towards Z9 7 D one another as described.

This will force the gripping; teeth 28 and 29 against the pipe 33. Now, when force is applied to the. handle of the wrenchin that direction which {tends to' move the portion 12 of the handle toward the portion? thetendency developed is for the transverse port1on19 to discontinue pivoting about the pin 10, and pivot about. the pin 21 because of the rigid conned tion between the after end of the transverse ,ably mounted upon portion '9 and thequpper jaw 13'whioh is in engagement with the top of the pipe 33. This will resultinforcing the pin 10 upwards a short distance within the slot 11, so that the bifurcated link 22. forces the lower jaw: 14 upwards with considerable force against the pipe 33. Thus the degree of compression exerted by the jaws 13 and l l-upon-the work gripped therebetween, is in direct proportion to the amount of force exerted upon the handle section 12 to turn the work,.resu lting in decreased tendency oi'the wrench to slip thereupon.

' I-claim:

1. A wrenchcomprising a shank, one end i of said'shank being extended to provide; a

handle, apair of opposed grippingjaws slidthe shank abovethe jaw wit-lithe lever upon the-end thereof upon the opposite side of the shank from said extended portion, and a spring normally retaining saidlever in its lowermost position in respect to the handle;

i. A wrench comprising 'a. shank,one end of said-shank. being extended to provide a handle, apair ofopposedigr-ipping;jawsislidvable longitudinally upon the shank, a lever mounted for pivotal movementon said shank, a portion of said; lever extending adjacent the handle, and means connecting. said. lever with saidjaws topress the. jaws together by squeezing thehandleand.-lever.=

5. Awrench comprising a shank, one: end of said shank beingextended to provide a handle, a pair ofopposedgripping jaws-slidable uponsaid shank, an. actuating lever comprising a transverse? pontion pivoted to and extending across the shank, and: a longitudinal portion extending. adjacent saidhandle, a link connecting one end of sai d'. transverse portion with? one of said'jaws, and another link connecting. the other endiofsaid transverse. portionwith the other. ofsaidjaws;

In testimony whereof'I have signed my name to this specification. v

. JALIES E. BLALOGK..

handle, an actuating lever comprising a transverse portlon pivoted to and extending across the shank and a longitudinal portion extending adjacent the handle, a linkv pivoted at one end to the uppermost of said aws and at the other end to said transverse portion adjacent the same end thereof as-that to which the longitudinalportion is aflixed, and-a link pivoted at one end to the lowermost of said jaws and" at the other end adjacent that end of thetransverse portion of the lever opposite 2. .A wrench comprising a shank, one end of said shankbeing extended to provide a handle, alpair of opposed gripping jaws slidably mounted upon the shank, a lever mountedfor pivotal and sliding movement longitudinally of said shank, a portion of said lever extending adjacent the handle, and means connecting said-lever with said jawsto press the aws together. by squeezingthe handle and lever.

the point of attachment of the other of said i links; r 

